Acoustic Measurements of BRC?

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Acoustic Measurements of BRC?

Postby dragonfly Jafe » Sat Jan 29, 2005 3:58 pm

Has anyone ever taken any acoustic measurements of the background sound of Black Rock City at night?
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Postby Badger » Sat Jan 29, 2005 5:05 pm

Yep.
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Postby Bob » Sat Jan 29, 2005 8:21 pm

What you say!!
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Re: Acoustic Measurements of BRC?

Postby Mister Jellyfish Mister » Sat Jan 29, 2005 9:13 pm

dragonfly Jafe wrote:Has anyone ever taken any acoustic measurements of the background sound of Black Rock City at night?


Right on Jafe. Still into the subharmonic thing? I would love to know gama ray and LF measurements just for fun. Good luck!
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Postby Isotopia » Sun Jan 30, 2005 4:13 am

Data available upon request.
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Re: Acoustic Measurements of BRC?

Postby dragonfly Jafe » Sun Jan 30, 2005 1:22 pm

Mister Jellyfish Mister wrote:
dragonfly Jafe wrote:Has anyone ever taken any acoustic measurements of the background sound of Black Rock City at night?


Right on Jafe. Still into the subharmonic thing? I would love to know gama ray and LF measurements just for fun. Good luck!


Oohhh! I like the Subharmonic name (not technically correct, but cool sounding none-the-less...) - "Welcome to Dr. Gavrieaux's House of SubHarmonic Happiness"

I need an infrasonic detector to ensure I don't accidentally dose the city with unwanted stimulus. It turns out to be basically off-the-shelf hardware (used in elephant communication studies), so I was wondering if anyone had ever brought anything like this to BRC (given all the drums, generators, sound art, etc)
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Postby robotland » Mon Jan 31, 2005 7:04 am

I've had a subharmonica in a drawer somewhere for YEARS- never learned to play it. I can, however, operate a pornograph......
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Postby dragonfly Jafe » Mon Jan 31, 2005 3:44 pm

robotland wrote: I can, however, operate a pornograph......
But do you know how to operate one manually?
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Postby theCryptofishist » Mon Jan 31, 2005 3:46 pm

dragonfly Jafe wrote:
robotland wrote: I can, however, operate a pornograph......
But do you know how to operate one manually?
Carefull. YOu can give yourself a nasty shock that way.
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Postby geekster » Mon Jan 31, 2005 6:06 pm

This seems a little scary ...


Infrasound: Very low-frequency sound that can travel long distances and easily penetrate most buildings and vehicles. Long-wavelength sound creates biophysical effects: nausea, loss of bowels, disorientation, vomiting, internal-organ damage, or death may occur. By 1972 an infrasound generator had been built in France. When activated it made the people in range sick for hours.



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Postby dragonfly Jafe » Mon Jan 31, 2005 6:31 pm

Sound in the 7-12 hz range is known to have this effect, even if the exposure is brief (less than 10 minutes). Walt Disney slowed down a recording of a 60hz power hum 1/5x from a soldiering iron using recording gear (this made it 12 hz) - less than 1 minute of this made his employees sick for hours. On the other hand, Nikoli Tesla used these frequencies in short bursts (30sec - 1 minute) in his "Rejuvenator", a device that perportedly invigorated ones nervous system and made one feel refreshed. I suspect in reality the effect was just ones adrenals kicking in. Mark Twain (samuel clemens) reportedly stayed on the device for too long with embarrasing results. The army calls this "the brown sound"

But I want to avoid these frequencies (for obvious reasons) and instead focus on the 16hz - 20hz range, which is actually the bottom of our musical octave, and the larger pipe organs create these sounds. The ocean surf typically has alot of 16hz energy also. So I am not proposing anything really radical (or dangerous).

The trick is to ensure that lower frequencies are not accidentally created...(say in a windstorm)
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Postby Ranger Genius » Mon Jan 31, 2005 8:12 pm

"the brown sound"


I thought that was just the guys from South Park. I tried to make the noise with my recorder, but it wouldn't work.
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Postby dragonfly Jafe » Mon Jan 31, 2005 9:16 pm

Ranger Genius wrote:
"the brown sound"


I thought that was just the guys from South Park. I tried to make the noise with my recorder, but it wouldn't work.


creating the signal is the easy part. Turning it into acoustic energy is the hard part. Very few commercially available speakers can produce meaningful amounts of sound in this region. Even the biggest conventional subwoofers do not do well. Also, trying to do it indoors creates more problems (the room interacts with the speaker). So unless you live in a very large house (like a concert hall) you probably could not listen to it no matter what you did. And if you did create it, your windows would suffer!

Outdoors on a flat plain is the best place for this stuff...

By recorder do you mean a flute-like object or a reel-to-reel recorder?
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Postby Ranger Genius » Mon Jan 31, 2005 9:29 pm

I mean a little plastic flute-thing we all had to learn to play in the fourth grade. Didn't you?
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Postby dragonfly Jafe » Mon Jan 31, 2005 9:42 pm

I though that was what you meant. Blow as you may on one of those plastic thingies, you won't be making any infrasound....(at least not that comes from the plastic thingie!)
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Postby Mister Jellyfish Mister » Mon Feb 07, 2005 8:32 pm

dragonfly Jafe wrote:I though that was what you meant. Blow as you may on one of those plastic thingies, you won't be making any infrasound....(at least not that comes from the plastic thingie!)


Hi Jafe. I acquired a didgeridoo today and you can get some pretty low resonance out of it, but are limited by the length and resonance of the pipe. It occurs to me that it would be an amazing stripper pole if it was vibrated by a blower.

What if we build something people could blow in thse same way with lips a-flutter-ing but attach the end of the cheap PVC pipe to a diaphram of sorts. Think of a subharmonic speaker driver facing the playa. Stretch a big piece of latex rubber accross a ring. Play with it to get the average simathetic half-octave resonance right, and you have a powerless, interactive, subharmonic device right there on the playa! Your thoughts?
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Postby Killbuck » Mon Feb 07, 2005 8:55 pm

I've been listening with interest... a new sonic death weapon?

It would be devious to point it at Center Camp during the fashion show... adjust it just so, switch it on and see 400 people unleash their bowels all at once. Devious.

However, have you considered the possibility that it may attract wildlife into the city? Pumas, voles, ardvarks, dogs and cats, wandering in?
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Postby Mister Jellyfish Mister » Mon Feb 07, 2005 9:37 pm

Kernul Killbuck wrote:I've been listening with interest... a new sonic death weapon?

It would be devious to point it at Center Camp during the fashion show... adjust it just so, switch it on and see 400 people unleash their bowels all at once. Devious.

However, have you considered the possibility that it may attract wildlife into the city? Pumas, voles, ardvarks, dogs and cats, wandering in?


I knew you would claim this weapon for the people. Therefore I have addressed this over on our camp thread:
viewtopic.php?p=142315#142315
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Postby geekster » Tue Feb 08, 2005 2:38 am

Kernul Killbuck wrote:I've been listening with interest... a new sonic death weapon?

It would be devious to point it at Center Camp during the fashion show... adjust it just so, switch it on and see 400 people unleash their bowels all at once. Devious.


No need. You have just described the pottys just across the street from Pinky's.
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Postby dragonfly Jafe » Tue Feb 08, 2005 10:10 am

Kernul Killbuck wrote:I've been listening with interest... a new sonic death weapon?


The possibilities are endless...as is resistance!

http://www.sempre.org.uk/list-archives/ ... 00406.html
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Postby geekster » Tue Feb 08, 2005 1:33 pm

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There will be a sonic weapon, er art-car on the playa!

Postby Malochango » Sun May 01, 2005 9:05 pm

Our focused beam acoustic transducers will create loads of havoc, er "fun" on the playa. But don't worry we're only looking for Rangers.
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Postby Isotopia » Mon May 02, 2005 11:07 am

But don't worry we're only looking for Rangers.


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Re: There will be a sonic weapon, er art-car on the playa!

Postby dragonfly Jafe » Mon May 02, 2005 3:18 pm

Malochango wrote:Our focused beam acoustic transducers will create loads of havoc, er "fun" on the playa. But don't worry we're only looking for Rangers.


Of course, the intensity is greatest where the sound is produced (and it is very hard to direct), so you will be having the most "fun" yourselves.

Be sure to clean up.
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Postby Malochango » Fri May 27, 2005 2:49 pm

oh really . . . ?

Looking forward to having a great time this year.

I love all you peoplez!
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Postby TheJudge » Wed Jun 08, 2005 1:59 pm

Doesn't anyone ever watch "Mythbusters" on the Discovery channel? They did an episode about the "brown note" The answer is that it does not exist.
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Postby dragonfly Jafe » Thu Jun 09, 2005 8:18 am

Mister Jellyfish Mister wrote:Hi Jafe. I acquired a didgeridoo today and you can get some pretty low resonance out of it, but are limited by the length and resonance of the pipe. It occurs to me that it would be an amazing stripper pole if it was vibrated by a blower.

What if we build something people could blow in thse same way with lips a-flutter-ing but attach the end of the cheap PVC pipe to a diaphram of sorts. Think of a subharmonic speaker driver facing the playa. Stretch a big piece of latex rubber accross a ring. Play with it to get the average simathetic half-octave resonance right, and you have a powerless, interactive, subharmonic device right there on the playa! Your thoughts?


For this to work, the "subharmonic" driver would have to be tuned to a low frequency (say 16 hz). Trying to excite a tuned system with a frequency that is much above (>2f) the resonance frequency is not very efficient. Further, to make significant sound levels, the driver would have to have to be making significant excursions (at least 5-10mm) - this would require a large energy source (probably not feasible with human lungs). Elephants for sure...

You could, however, make a long tuned pipe (aka didgeridoo) that a single person could excite (think those long horns from the Alps...)

You could also make a long stripper tube (out of 4" PVC say), and make a reed at the bottom that is powered by a blower (or blow across the top like a bottle), that would cause a resonant tone.

Another idea I saw somewhere was to take a long rope, attach a resonant diaphragm to one end and secure the other to a strong stake. When the wind blows, you stand so that the rope is perpendicular to the wind and pull it tight. The wind rushing over the string causes it to vibrate, and the vibrations are amplified by the resonant diaphragm. The tension on the rope determines the "note". Some obvious safety issues to sort out, but an interesting concept!
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Postby TheJudge » Thu Jun 09, 2005 7:47 pm

I think we're talking much lower. 5-20 Hz.

Here's more info:
http://www.meyersound.com.au/brownnote.shtm
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Postby robotland » Fri Jun 10, 2005 8:43 am

You only Hz. the one you love.
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